$query->_element['participant_id'] = 1;
$query->_tables['civicrm_participant'] = $query->_whereTables['civicrm_participant'] = 1;
//add fee level
if (!empty($query->_returnProperties['participant_fee_level'])) {
$query->_element['participant_id'] = 1;
$query->_tables['civicrm_participant'] = $query->_whereTables['civicrm_participant'] = 1;
//add fee level
if (!empty($query->_returnProperties['participant_fee_level'])) {